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probe type low water cut offs, this may occur each time the
low water cut off detects a low water condition. If this is the
case, an isolation relay is required for the thermostat circuit.
A 24 volt single pole single throw (SPST)normally open (NO)
relay is required, such as the Honeywell R8222A or
equivalent. Wire as shown in Fig. 14A or Fig. 14B.
VENT DAMPER
The boiler is equipped with a factory wired harness with 4
pin molex plug, that plugs into the 4 pin molex receptacle
inside the vent damper operator.
The vent damper must be connected for the boiler to operate.
Wiring diagrams follow for the various different models.
CAUTION
Label all wires prior to disconnection
when
servicing
controls.
Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
VENT DAMPER
4 PIN
24 VOLT
TRANSFORMER
T
"_\_
ELECTRONIC
TO LWCO AND
THERMOSTAT
IGNITION
SYSTEM
.....
FIELD WIRING
VENT DAMPER
4 PIN
MOLEX PLUG
__y
_ ISOLATION
RELAY
24V.
\SPST
N,O, HONEYWELL
I
J
\R8222A
OR EQUIVALENT
\
24 VOLT
IIF
....
_::__
-K---_
-_0
TRANSFORMER
!m Z-I PRESSURE
LIMIT
wBT,
Ti
I /
_t"
_"'--_
TERMINAL
B
/ _- c<o---
G
OF LWCO
1
_- ELECTRONIC
TO
WCO AND
THERMOSTAT
IGNITION SYSTEM
---
FIELD WIRING
.....
12
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